Fix hasChanges() on text fields

Change-Id: Iee1a4d32ab5ed1bd9c692facc7653a9382732d2a
Merge commit 'refs/changes/57/1557/1' of http://gerrit.tuleap.net/tuleap into HEAD

* http://gerrit.tuleap.net/tuleap:
  Fix hasChanges() on text fields

Change-Id: I76d05fb557ac190a505d72cbc7ce272ba4987d3c
This is Tuleap 6.7.99.38

Change-Id: Iad496052da1b688c10d51d761fe7d88778a94a18